package top.jacktgq.hsp.netty.future_listener;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.CharsetUtil;

/**
 * @Author CandyWall
 * @Date 2020/11/12--13:42
 * @Description Netty客户端事件的处理器类-future-listener机制
 */
public class NettyClientHandler extends ChannelInboundHandlerAdapter {
    @Override
    //当通道就绪就会触发该方法
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        System.out.println("client " + ctx);
        ctx.writeAndFlush(Unpooled.copiedBuffer("hello，服务器端", CharsetUtil.UTF_8));
    }

    @Override
    //通道有读取事件时会触发
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        ByteBuf buf = (ByteBuf) msg;
        System.out.println("服务器回复的消息：" + buf.toString(CharsetUtil.UTF_8));
        System.out.println("服务器的地址：" + ctx.channel().remoteAddress());
    }

    @Override
    //处理异常，一般是需要关闭通道
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        cause.printStackTrace();
        ctx.close();
    }
}
